<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .progress {
            height: 25px;
            width: 400px;
            border-radius: 15px;
            background-color: #272425;
            border: 3px solid #272425;
            box-sizing: border-box;
            margin-bottom: 30px;
        }

        .inner {
            width: 50%;
            height: 20px;
            border-radius: 10px;
            text-align: right;
            position: relative;
            background-color: #409eff;
            background-size: 20px 20px;
            box-sizing: border-box;
            transition: all 1s;
        }

        .inner span {
            position: absolute;
            right: -20px;
            bottom: -25px;
        }
    </style>
</head>

<body>
    <script src="./vue.js"></script>
    <div id="app">
        <div class="progress">
            <div class="inner" :style="{width:wid+'%'}">
                <span>{{wid}}%</span>
            </div>
        </div>
        <button @click="wid=25">设置25%</button>
        <button @click="wid=50">设置50%</button>
        <button @click="wid=75">设置75%</button>
        <button @click="wid=100">设置100%</button>
    </div>


    <script>
        const app = new Vue({
            el: '#app',
            data: {
                wid:25
            }
        })
    </script>
</body>

</html>